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CN-122020841-A - Static test load partition determination method for bilateral symmetry radome

CN122020841ACN 122020841 ACN122020841 ACN 122020841ACN-122020841-A

Abstract

The invention belongs to the technical field of airplane test and measurement, and particularly relates to a method for determining static test load partitions of a bilateral symmetry radome, which comprises the following steps of firstly determining four points O 1 、O 2 、O 3 、O 4 of the top and the root on the symmetry plane of the radome; calculating the angle of the connecting line of boundary points of each quadrilateral subarea and the central point of the radome according to the number of the unilateral annular subareas, screening out nodes with the same coordinates in the O 1 、O 2 X direction, and calculating the minimum value of the node number tangent value with the same angle and the X coordinate, namely, one boundary point of the subarea, and other boundary points can be logically obtained according to the method. The partitioning method is convenient and accurate.

Inventors

  • GUO XIUMEI
  • ZHAO XU
  • Shu Shenyunhao

Assignees

  • 中国航空工业集团公司济南特种结构研究所

Dates

Publication Date
20260512
Application Date
20251224

Claims (8)

  1. 1. The method for determining the static test load partition of the bilateral symmetry radome is characterized by comprising the following steps of: step 1, importing node coordinate data in a radar cover finite element model into a table; Step 2, dividing the imported node coordinate data into two groups of data Array1 and Array2 according to a symmetry plane; Step 3, determining four points O 1 、O 2 、O 3 、O 4 ,O 1 and O 2 on a symmetrical plane of the radome, wherein the four points are upper and lower side boundary points of the symmetrical plane, and O 3 and O 4 are optional upper and lower two points on the symmetrical plane, and determining the number t 1 of circumferential subareas and the number t 2 of expanding subareas on one side of the symmetrical plane of the radome; Step 4, calculating the average value of coordinates of two points O 1 、O 2 in the aviation direction Node arrays Grid b with the x coordinate identical to the Middle x1 value are respectively screened from two groups of data of Array1 and Array 2; Step 5, the same calculation as that of step 4 is executed on two points of O 3 、O 4 , and a node array Grid c is obtained; step 6, calculating the average value of the coordinates of the two points O 1 、O 2 in the longitudinal direction Calculating tangent value between each node in node array Grid b and Middle y1 Determining the angle of each partition boundary point according to the number t 1 of the circumferential partitions Calculating a minimum value Outputting a node number A i associated with the minimum value and a coordinate value A ix 、A yi 、A iz thereof; step 7, performing the same calculation as in step 5 on two points of O 3 、O 4 and an array Grid c to obtain a node number B i associated with the minimum value and a coordinate value B ix 、B yi 、B iz thereof; Step 8, according to the number of the spanwise partitions Screening out node numbers C i and D i ,i=1~t 2 -1 between O 1 and O 3 and between O 2 and O 4 ; Step 9, calculating the average value of coordinates of two points C i 、D i in the longitudinal direction according to the node numbers C i and D i Calculating tangent value between each node in node array Grid b and Middle y2 Determining the angle of each partition boundary point according to the number t 1 of the circumferential partitions Calculating a minimum value Outputting a node number E i associated with the minimum value and a coordinate value E ix 、E yi 、E iz thereof; step 10, the same calculation as in step 9 is performed on C i 、D i and array Grid c to obtain node number F i associated with the minimum value and its coordinate value F ix 、F yi 、F iz .
  2. 2. The method for determining the static test load partition of a radome of claim 1, wherein in the step 1, the finite element model file is bdf version.
  3. 3. The method for determining the static test load partition of the radome of claim 1, wherein in the step 2, z=0 is a model symmetry plane, and to ensure the accuracy of the calculation of the boundary points, all the node data are divided into two groups according to the symmetry plane.
  4. 4. The method of claim 1, wherein in step 3, O 1 and O 2 are upper and lower boundary points of the symmetry plane, and O 3 and O 4 are optional upper and lower boundary points of the symmetry plane.
  5. 5. The method for determining the cyclic zoning of the static test load of the radome according to claim 1, wherein in the step 3, the number t 1 of the cyclic zoning of the symmetrical plane on one side of the radome and the number t 2 of the heading zoning are determined according to the result of the static strength simulation calculation.
  6. 6. The method for determining the static test load partition of the radome of claim 1, wherein in the steps 4 and 5, the array Grid b 、Grid c comprises a node number and three coordinate values of the node.
  7. 7. The method for determining the static test load zone of a radome as defined in claim 1, wherein in the steps 6, 7, if θ is 90 °, calculation is required In the steps 9 and 10, if θ is 90 °, calculation is required 。
  8. 8. The method of claim 1, wherein in step 8, C i and D i ,i=1~t 2 -1 are nodes having the same x-coordinate on the plane of symmetry of the radome, such as C 1 and D 1 have the same x-coordinate.

Description

Static test load partition determination method for bilateral symmetry radome Technical Field The invention belongs to the technical field of airplane test and measurement, and particularly relates to a method for determining static test load partitions of a bilateral symmetry radome. Background The radome static test is an important precondition for verifying whether the radome meets design requirements and realizing safe flight. The radome mainly bears pneumatic load, the pneumatic outer surface of the radome is usually required to be partitioned during static test, and tension and compression pads are used for uniformly loading in each partition to simulate structural stress. The number of partitions and the determination of the location of the loading point after the partitions both affect the results of the static test. Radomes are often complex in appearance, so it is particularly important how to determine the loading partition during static test design and find the loading point position. Typically, the determination of radome surface partitioning may be manually partitioned by finite element software, which is complex and time consuming. Disclosure of Invention In order to solve the problems, the invention provides a program method for conveniently and rapidly partitioning the outer surface of a radome according to the number of partitions by utilizing VBA and outputting the coordinates of the boundary points and loading points of each partition when designing the static test of the bilateral symmetry radome, and provides data for the subsequent static test. The invention provides a method for determining static test load partitions of a bilateral symmetry radome, which comprises the following steps: step 1, importing node coordinate data in a radar cover finite element model into a table; Step 2, dividing the imported node coordinate data into two groups of data Array1 and Array2 according to a symmetry plane; Step 3, determining four points O 1、O2、O3、O4,O1 and O 2 on a symmetrical plane of the radome, wherein the four points are upper and lower side boundary points of the symmetrical plane, and O 3 and O 4 are optional upper and lower two points on the symmetrical plane, and determining the number t 1 of circumferential subareas and the number t 2 of expanding subareas on one side of the symmetrical plane of the radome; Step 4, calculating the average value of coordinates of two points O 1、O2 in the aviation direction Node arrays Grid b with the x coordinate identical to the Middle x1 value are respectively screened from two groups of data of Array1 and Array 2; Step 5, the same calculation as that of step 4 is executed on two points of O 3、O4, and a node array Grid c is obtained; step 6, calculating the average value of the coordinates of the two points O 1、O2 in the longitudinal direction Calculating tangent value between each node in node array Grid b and Middle y1Determining the angle of each partition boundary point according to the number t 1 of the circumferential partitionsCalculating a minimum valueOutputting a node number A i associated with the minimum value and a coordinate value A ix、Ayi、Aiz thereof; step 7, performing the same calculation as in step 5 on two points of O 3、O4 and an array Grid c to obtain a node number B i associated with the minimum value and a coordinate value B ix、Byi、Biz thereof; Step 8, according to the number of the spanwise partitions Screening out node numbers C i and D i,i=1~t2 -1 between O 1 and O 3 and between O 2 and O 4; Step 9, calculating the average value of coordinates of two points C i、Di in the longitudinal direction according to the node numbers C i and D iCalculating tangent value between each node in node array Grid b and Middle y2Determining the angle of each partition boundary point according to the number t 1 of the circumferential partitionsCalculating a minimum valueOutputting a node number E i associated with the minimum value and a coordinate value E ix、Eyi、Eiz thereof; step 10, the same calculation as in step 9 is performed on C i、Di and array Grid c to obtain node number F i associated with the minimum value and its coordinate value F ix、Fyi、Fiz. Advantageously, in step 1, the finite element model file used is version bdf. Advantageously, in step 2, z=0 is a model symmetry plane, and to ensure accuracy of boundary point calculation, all node data are divided into two groups according to the symmetry plane. Advantageously, in step 3, O 1 and O 2 are upper and lower boundary points of the symmetry plane, and O 3 and O 4 are optional upper and lower boundary points of the symmetry plane. Advantageously, in step 3, determining the number of circumferential partitions t 1 and the number of heading partitions t 2 of the symmetrical plane on one side of the radome according to the result obtained by the static intensity simulation calculation; Advantageously, in steps 4 and 5, the array Grid b、Gridc includes a node number and three coordinate